Is anal really a 100%-proof birth control?

[sana]

I shoot every load behind her second sprincter. So most of the cum will not find a way out. And yes, sometimes I cream up her little star with some drops of cum. She wipes it off and that’s it.

I can’t get anyone pregnant anymore, so there’s no risk, but I can’t think of any possible scenario a women can get pregnant from anal, unless she want to. And on this forum people gried gettibg pregant without vaginal penetration, which turnied out to be hard to acheive.

I feel many people are ignorant about what it takes to get pregnant.

Yes you are right. Its really hard.
If you want to get pregnant... deep vaginal is really the way. Even shallow vaginal wont get sperm close enough to the eggs.

[NoVagAnal]

The vagina excretes a type of acidic fluid that is meant to kill bacteria or anything else that might get in. It's a rather large opening in the body and requires that protection. It also kills the sperm. So a group of sperm swimming twords the egg will have the outer layer die to the acid. A small amount leaking from outside is not going to make it anywhere. And the sperm is probably dead before it even gets to the vagina because it has to be kept warm. And if it leaks from anus to vagina it will get exposed to the outside air and die. So it would be almost magic to get sperm leaking from the ass to impregnate a girl.